Journal
ENERGY STORAGE MATERIALS
Volume 15, Issue -, Pages 14-21Publisher
ELSEVIER
DOI: 10.1016/j.ensm.2018.03.003
Keywords
Aqueous Zn-ion batteries; Na3V2(PO4)(2)F-3 cathode; Zinc dendrite; Zn(CF3SO3)
Funding
- National Natural Science Foundation of China [51622703, 51774148]
- Fundamental Research Funds for the Central Universities [2017KFKJXX001, 2015ZDTD030]
- National Thousand Talents Program of China
- China Postdoctoral Science Foundation [2017M622421]
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Aqueous rocking-chair Zn-ion batteries based on the intercalation/deintercalation chemistry of divalent Zn2+ ions are appealing area, but the lack of suitable cathodes to tolerate the stable insertion/extraction of Zn2+ ions as well as practical approaches to minimize the dendrite growth of zinc anode are still the major challenges. Here, we report a rechargeable aqueous Zn-ion battery based on a new intercalated Na3V2(PO4)(2)F-3 cathode coupled with a carbon film functionalizing Zn anode and 2M Zn(CF3SO3)(2) electrolyte. This battery exhibits a high voltage of 1.62 V, energy density of 97.5 W h kg(-1), as well as superior cyclability of 95% capacity retention over 4000 cycles. The remarkable performance originates from the dendrite-free of Zn anode assisted by a carbon film changing the deposition behavior of Zn, the protective layer of solid electrolyte interphase on Na3V2(PO4)(2)F-3 cathode and the highly reversible insertion/extraction chemistry of Zn2+ ions in Na3V2(PO4)(2)F-3 with a much small volume change of 0.22% as evidenced by ex-situ XPS and XRD analysis. Moreover, this system can be delicately designed as a flexible soft package battery with both good flexibility and cyclability (80.6% capacity retention over 600 cycles).
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